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NAVCEN operates the Coast Guard Maritime Differential GPS (DGPS) Service
and the developing Nationwide DGPS Service, consisting of two control
centers and over 60 remote broadcast sites. The Service broadcasts
correction signals on marine radiobeacon frequencies to improve the
accuracy of and integrity to GPS-derived positions. The Coast Guard DGPS
Service provides 10-meter accuracy in all established coverage areas.

Typically, the positional error of a DGPS position is 1 to 3 meters,
Greatly enhancing harbor entrance and approach navigation. The System
provides service for coastal coverage of the continental U.S., the Great
Lakes, Puerto Rico, portions of Alaska and Hawaii, and a greater part of
the Mississippi River Basin. Many foreign nations are implementing
standard DGPS services modeled after the U.S. Coast Guard's system to
significantly enhance maritime safety in their critical waterways.

http://www.navcen.uscg.gov/dgps/default.htm

> I'm involved in a project examining movements & microhabitat use in
> European eels (using biotelemetry). As part of this we need to upgrade
> our GPS kit to a differential GPS, i.e. something that can give
> sub-meter accuracy, is rugged enough to be used in boats in the Irish
> climate, and that integrates well with ArcView. Has anyone got
> views/recommendations on what is the best/worst system to invest in?

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